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<!DOCTYPE html> < html lang = 'en' >< head >< title > [kind.of.qty]</ title >< meta charset = 'UTF-8' />< link rel = 'stylesheet' type = 'text/css' href = '14882.css' />< link rel = 'stylesheet' type = 'text/css' href = 'https://fonts.googleapis.com/css2?family=Noto+Serif' />< link rel = 'stylesheet' type = 'text/css' href = 'https://fonts.googleapis.com/css2?family=Noto+Sans' />< link rel = 'stylesheet' type = 'text/css' href = 'https://fonts.googleapis.com/css2?family=Noto+Sans+Mono' />< link rel = 'icon' href = 'icon.png' />< link rel = 'stylesheet' type = 'text/css' href = 'expanded.css' title = 'Normal' />< link rel = 'alternate stylesheet' type = 'text/css' href = 'colored.css' title = 'Notes and examples colored' />< link rel = 'alternate stylesheet' type = 'text/css' href = 'normative-only.css' title = 'Notes and examples hidden' /></ head >< body >< div class = 'wrapper' >< h1 >< a class = 'secnum' style = 'min-width:50pt' > 5</ a > Quantities and units library < a class = 'abbr_ref' href = 'index.html#quantities' > [quantities]</ a ></ h1 >< h2 >< a class = 'secnum' style = 'min-width:65pt' > 5.4</ a > Reference < a class = 'abbr_ref' href = 'qty.ref.html#kind.of.qty' > [qty.ref]</ a ></ h2 >< h3 >< a class = 'secnum' style = 'min-width:80pt' > 5.4.3</ a > Quantity specification < a class = 'abbr_ref' href = 'qty.spec.html#kind.of.qty' > [qty.spec]</ a ></ h3 >< h4 >< a class = 'secnum' style = 'min-width:95pt' > 5.4.3.3</ a > Types < a class = 'abbr_ref' href = 'qty.spec.types.html#kind.of.qty' > [qty.spec.types]</ a ></ h4 >< h4 >< a class = 'secnum' style = 'min-width:110pt' > 5.4.3.3.4</ a > Kind of < a class = 'abbr_ref' > [kind.of.qty]</ a ></ h4 >< div class = 'texpara' >< span id = 'lib:kind_of_' >< div class = 'marginalizedparent' >< a class = 'itemDeclLink' href = '#lib:kind_of_' > 🔗</ a ></ div >< span class = 'codeblock' >< span class = 'keyword' > namespace</ span > mp_units < span class = 'curlybracket' > {</ span >
< span class = 'keyword' > template</ span >< span class = 'anglebracket' > < </ span >< a href = 'qty.spec.concepts.html#concept:QuantitySpec' title = '5.4.3.2 Concepts [qty.spec.concepts]' >< span id = 'conceptref:QuantitySpec' >< span class = 'tcode_in_codeblock' > QuantitySpec</ span ></ span ></ a > Q< span class = 'anglebracket' > > </ span >
< span class = 'keyword' > requires</ span >< span class = 'parenthesis' > (</ span >< span class = 'operator' > !</ span >< a class = 'index' id = 'conceptref:QuantityKindSpec' ></ a >< i > QuantityKindSpec</ i >< span class = 'anglebracket' > < </ span > Q< span class = 'anglebracket' > > </ span >< span class = 'parenthesis' > )</ span > < span class = 'operator' > & </ span >< span class = 'operator' > & </ span > < span class = 'parenthesis' > (</ span >< i > get-kind-tree-root</ i >< span class = 'parenthesis' > (</ span > Q< span class = 'curlybracket' > {</ span >< span class = 'curlybracket' > }</ span >< span class = 'parenthesis' > )</ span > < span class = 'operator' > =</ span >< span class = 'operator' > =</ span > Q< span class = 'curlybracket' > {</ span >< span class = 'curlybracket' > }</ span >< span class = 'parenthesis' > )</ span >
< span class = 'keyword' > struct</ span > kind_of_ < span class = 'keyword' > final</ span > < span class = 'operator' > :</ span > Q< span class = 'operator' > ::</ span >< i > base-type</ i > < span class = 'curlybracket' > {</ span >
< span class = 'keyword' > using</ span > < i > base-type</ i > < span class = 'operator' > =</ span > kind_of_; < span class = 'comment' > // < i > exposition only</ i ></ span >
< span class = 'keyword' > static</ span > < span class = 'keyword' > constexpr</ span > < span class = 'keyword' > auto</ span > < i > quantity-spec</ i > < span class = 'operator' > =</ span > Q< span class = 'curlybracket' > {</ span >< span class = 'curlybracket' > }</ span > ; < span class = 'comment' > // < i > exposition only</ i ></ span >
< span class = 'curlybracket' > }</ span > ;
< span class = 'curlybracket' > }</ span >
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</ span ></ span ></ div >< div class = 'para' id = '1' >< div class = 'marginalizedparent' >< a class = 'marginalized' href = '#1' > 1</ a ></ div >< div class = 'sourceLinkParent' >< a class = 'sourceLink' href = 'https://github.com/mpusz/mp-unitse9c5f7236ebfe1b287a5a4a49aaf57fbefa87233/source/quantities.tex#L1832' > #</ a ></ div >< div class = 'texpara' >< div id = '1.sentence-1' class = 'sentence' >< span class = 'texttt' > kind_< span class = 'shy' ></ span > of< span class = 'anglebracket' > < </ span > Q< span class = 'anglebracket' > > </ span ></ span > represents a kind of quantity (< a href = "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=112-01-04" > IEC 60050, 112-01-04</ a > ) < span class = 'texttt' > Q</ span >< a class = 'hidden_link' href = '#1.sentence-1' > .</ a ></ div ></ div ></ div ></ div ></ body ></ html >
